Reflector-lamp.



F. KRATZ.

REFLECTOR LAMP.

APPLICATION FILED Nov. 29, 1913.

LMWWL Patented om.. 26, 1915z lllhllTED ETTE@ PATENT FRANZ KRATZ, OFSTUTTGART, GERMANY, ASSIGNOR T0 THE FIRM 0F ROBERT BOSCH, OF STUTTGART,GERMANY.

REFLEcToR-LAMP.

Application filed November 29, 19413.

13e it known that I, FRANZ Kna'rz, a subject of the Emperor of Germany,residing at Schlosstrasse 5t), Stuttgart, Germany, have invented certainnew and useful I1nproveinents in Reflector-Lamps; and l do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

The present invention relates to reflector lamps or headlights for useon moving vehicles such as automobiles and motor boats, or forstationary work, the construction being characterized by an arrangementwhereby the incandescent lamp may be installed and removed through anopening in the rear of the reflector and may be exposed for renewal in aconvenient and rapid manner by swinging the reflector and theincandescent lamp as a unit on a hinge connection with the lamp housing.The front cover may be permanently fastened over the reflector, and thelamp may be installed and removed in such a manner that the highlypolished and sensitive surface of the reflector is not eX- posed tocontact with the hands or tools during the renewal periods, whereas theentrance of dust. or other foreign matter is substantially eliminated.

ln the accompanying drawings illustrating the preferred form ofconstruction, Figure 1 represents a central vertical section of thereflector lamp; and Fig. 2 represents on an enlarged scale a detail ofthe hinge connection between the reflector and the housing'.

The reflector lamp comprises the cover a, of glass, the parabolicreflector I) having a highly polished reflecting surface, the housing(l, and the incandescent lamp m preferably mounted at the principalfocus of the reflector. The reflector has an outstanding peripheralflange in surface contact with the covercz, and the two are heldpermanently together in a circular frame la. The rubber ring g insertedbetween the frame and the glass produces uniform pressure all around andprevents rattling of the parts, while the split ring f is insertedbehind the peripheral flange of the reflector in an internal lgroove inthe frame to hold the parts permanently together. The housing hasriveted to it a peripheral rim Z and also a hinge member t'. The frame7c is slotted at s and terminates in Specification of Letters Patent.

Patented Oct. 26, 1915,

Serial No. 803,657.

two separated hinge arms z' forming a hinge member coperating with thehinge member t for swinging the cover a and the reflector b as a unit,as shown in broken lilies in Fig. l, to expose the rear of thereflector. The tubular lamp m is normally held rigidly in the space.between the reflector and the cover by pressing it into the socket ywwhich is screwed into a receiving member attached to the rear of thereflector around the opening therein. Thus when the rear of thereflector is exposed, the lamp m may be readily removed and by pullingit out of its socket, and another lamp substituted for it, withoutthepossibility of injuring the reflecting surface of the reflector, andwithout permitting the entrance of dust or other matter into the spacebetween the reflecting surface and the cover. The hinge bolt c isprovided with a nut, which may be screwed up to tightly clamp the rim ofthe frame la around the rim Z of the housing to thereby rigidly hold theparts in normal position, the outside diameter of the cover a and of theperipheral flange of the reflector Z) being of a sufllciently smallerdiameter than the interior of the frame Ic as to preclude any bindingaction when the frame is contracted. 1t will be apparent that byloosening up on the bolt c, the frame may be pulled 0H1 the rim Z andthe unit swung on the hinge for the aforesaid purpose. The electricalconnection to the filament of the lamp m is led through the opening lvin the housing.

Having thus described'my invention, what 1 claim is:

l, In a` reflector lamp, a reflector having a rear opening, a cover onthe front of the reflector, an incandescent lamp designed to passthrough said opening, means holding the lamp in place in the spacebetween the reflector and the cover, a lamp housing, and a hingeconnection fastened to the reflector and housing and by which the rearof' the reflector may be swung to exposed position for installing andremoving the llamp through said opening.

2. lln a reflector lamp, a reflector having a rear opening and beingprovided with a front cover, a lamp socket fixed to the reflector andregistering with said opening, an incandescent lamp having a baseengaging and supported by the socket, the lamp being designed to passthrough the socket whereby it may be removed or placed in postion rolnthe rear end of the socket, a lamp housing normally inelosingq'thereflector and lamp socket.

, and a hinge connection between the housing having means cooperativewith the hinge arms to form a hinge for swinging the reflector to exposethe rear thereof, and means for drawing the hinge arms together tosqueeze the rimtightly around 'the housing vto thereb)v hold the partsfixed in normal position.

4. In a reflector lamp, a reflector having an opening at the rearthereof, a cover for the reflector, an incandescent lamp fastened to thereflector so as to project through said opening into the space betweenthe reflector and the cover, a frame for the reflector and cover havinga split rim terminating in norn1all \v separated hinge-arms, a housinghaving a rim and liingearins cooperative with the other hinge-arms sothat the' reflector and cover may be swung to expose the lamp forremoving and inserting it through said opening, and means for drawingthe hingearms ot the frame together so as to squeeze the rim of theframe tightly around the rim of the housing and thereby hold the partsfixed in normal nosition; substantially as described.

In testimony whereof I aflix my signature, in presence of two witnesses.

FRANZ KRATZ.

Witnesses PAUL VVALFART,

Y HERMANN oHNEIDER.

Goples of this patent may be obtainedfor five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

